421906402 has 8 divisors (see below), whose sum is σ = 635381712. Its totient is φ = 210112500.

The previous prime is 421906399. The next prime is 421906403. The reversal of 421906402 is 204609124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (421906403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419724 + ... + 420727.

It is an arithmetic number, because the mean of its divisors is an integer number (79422714).

Almost surely, 2^421906402 is an apocalyptic number.

421906402 is a deficient number, since it is larger than the sum of its proper divisors (213475310).

421906402 is a wasteful number, since it uses less digits than its factorization.

421906402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840704.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 421906402 is about 20540.3603181638. The cubic root of 421906402 is about 750.0186081309.

The spelling of 421906402 in words is "four hundred twenty-one million, nine hundred six thousand, four hundred two".